Incandescent-lamp socket.



4 PATENTED FEB 5, 1907. F. WUNDERLIGH'. INGANDBSGENT LAMP SOCKET;

APPLICATION FILED Nov/2s, 1906'.

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nnrrnn sm l ng PATENT OFFIG E.

' FREDRIOK WUNDERLICH, OF SWISSVALE, PENNSYLVANIA.

lNCANDESCENT-LAMP SOCKET.

Specification of Letters Patent.

Patented Feb. 5, 1907.

Application filed November 28, 1906. Serial No. 345.419.

1 merits in Incandescent- Lamp Sockets, of

which the following is a specification, reference being had therein tothe accompanying drawings.

This invention relates to incandescentlamp sockets; and the inventionhas for its object the provision of novel means for looking anincandescent bulb within a socket, whereby it cannot be stolen orremoved until the bulb is broken.

My 'inventionaims to provide a novel form of lock for retaining the endof an incandescent lamp bulb within its socket, said lock being simple,inexpensive, and easily embodied in the general construction of socketsat present used. To this end I provide a socket with a spring normallyheld under tension by the outer casing of the socket. The spring isadapted to engage in the threaded bulb-sleeve and prevent its removaluntil the outer casing of the socket is -removed, this only beingaccomplished by breaking the bulb supported by the threaded sleeve.

The detail construction of my improved incandescent-lamp socket will bepresently described and then specifically pointed out in the appendedclaims.

Referring to the drawings forming part of this specification, likenumerals of reference designate corresponding parts throughout theseveral views, in which Figure 1 is a side elevation of my improvedsocket, partly in section. Fig. 2 is a similar view of the socket, theouter casing thereof being removed. Fig. 3 is a side elevation of thebulb-supporting sleeve. Fig. 4 is a cross-sectional view taken on theline a; 28 of Fig. 3. Fig. 5 is a crosssectional vieW taken on the liney y of Fig. 1. Fig. 6 is an elevation of the socket-casing. Fig. 7 is adetail view of a portion of the socket. crosssectional view taken on theline to w of Fig. 2.

In the accompanying drawings I have illustrated .a conventional form ofsocket embodying an insulating-block 1, having a depending threadedshell 2 and a contact-point 3. The block 1 is covered by a cap 4,through which wires 5 pass, said wires transmitting Fig. 8 1s aanelectrical current to the shell 2 and the point 8. The cap 4 is providedwith inwardly-extending screws 6, said screws being adapted to enterbayonet-shaped slots 7, formed in the upper edges of the socket-casing8. The socket-casing 8 is slotted, as at 9, to clear the thumb-buttom 10of a suitable switch mechanism located within the insu-- lating-block 1,said mechanism being employed to break and complete the electricalcircuit transmitted through the wires 5, enterin the insulating-block l.

in connection with the socket just described a lamp-bulb 11 is used,said bulb being carried by a threaded sleeve 12 and having the usualcontact-point 14.

My invention resides in providing the threaded sleeve 12 with twobeveled grooves 15, and adapted to engage in one of said grooves is thebent edge 16 of a flat spring 17, secured upon the shell 2. Inpracticethe casing 8 is placed in the cap 4 and secured therein by thescrews 6 entering the bayonetslots 7 tohold the spring 17 firmly uponthe shell 2. tated into the shell 2, the bent end 16 oi the spring 17 isadapted to engage in one of the grooves 15, said grooves being beveledto permit of the rotation of the sleeve 12 within the shell 2, thespring preventing the sleeve 12 from being rearwardly rotated. It willthus be seen that when the sleeve 12, carrying the bulb .11, isoncelocked within the socket it will be necessary for the bulb to bebroken before the casing 8 can be removed, as said bulb is of a greaterdiameter at its larger end than the casing8. When the bulb 11 is brokenthe casing 8 can be easily removed, the re moval of said casingreleasing the spring 17 and allowing the sleeve 12 to be removed. It isobvious that a new bulb and sleeve 12 When the threaded sleeve 12 isrocan be readily mounted in the socket after are permissible by theappended claims may be resorted to Without departing from the spirit andscopeof the invention.

What I claim, and desire to secure by Letters Patent, is

i said shell and protruding therein, a threaded 1. In anincandescent-bulb lock, the com- I sleeve adapted to engage in saidshell and be engaged by said spring, and means detach- I 5 ably securedto said socket to hold said spring in engagement with said shell andsleeve.

In testimony whereof I affix my signature in the presence of twowitnesses.

FR'EDRICK WUNDERLIOH.

bination with a socket having a threaded shell, of a spring secured tosaid shell and protruding therein, a threaded sleeve adapted to engagein said shell and havinga beveled groove to receive the end of saidspring, and an outer casing detachably secured to said socket andbearing upon said spring. WVitnesses:

2. The combination with a socket having MAX H. SROLOVI-TZ, an innerthreaded shell, a springsecured to K. H. BUTLER.

